xref: /netbsd-src/sys/dev/ic/nvmevar.h (revision 7e30e94394d0994ab9534f68a8f91665045c91ce)
1 /*	$NetBSD: nvmevar.h,v 1.12 2017/02/28 20:53:50 jdolecek Exp $	*/
2 /*	$OpenBSD: nvmevar.h,v 1.8 2016/04/14 11:18:32 dlg Exp $ */
3 
4 /*
5  * Copyright (c) 2014 David Gwynne <dlg@openbsd.org>
6  *
7  * Permission to use, copy, modify, and distribute this software for any
8  * purpose with or without fee is hereby granted, provided that the above
9  * copyright notice and this permission notice appear in all copies.
10  *
11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18  */
19 
20 #include <sys/bus.h>
21 #include <sys/cpu.h>
22 #include <sys/device.h>
23 #include <sys/mutex.h>
24 #include <sys/pool.h>
25 #include <sys/queue.h>
26 
27 struct nvme_dmamem {
28 	bus_dmamap_t		ndm_map;
29 	bus_dma_segment_t	ndm_seg;
30 	size_t			ndm_size;
31 	void			*ndm_kva;
32 };
33 #define NVME_DMA_MAP(_ndm)	((_ndm)->ndm_map)
34 #define NVME_DMA_LEN(_ndm)	((_ndm)->ndm_map->dm_segs[0].ds_len)
35 #define NVME_DMA_DVA(_ndm)	((uint64_t)(_ndm)->ndm_map->dm_segs[0].ds_addr)
36 #define NVME_DMA_KVA(_ndm)	((void *)(_ndm)->ndm_kva)
37 
38 struct nvme_softc;
39 struct nvme_queue;
40 
41 typedef void (*nvme_nnc_done)(void *, struct buf *, uint16_t, uint32_t);
42 
43 struct nvme_ccb {
44 	SIMPLEQ_ENTRY(nvme_ccb)	ccb_entry;
45 
46 	/* DMA handles */
47 	bus_dmamap_t		ccb_dmamap;
48 
49 	bus_addr_t		ccb_prpl_off;
50 	uint64_t		ccb_prpl_dva;
51 	uint64_t		*ccb_prpl;
52 
53 	/* command context */
54 	uint16_t		ccb_id;
55 	void			*ccb_cookie;
56 #define NVME_CCB_FREE	0xbeefdeed
57 	void			(*ccb_done)(struct nvme_queue *,
58 				    struct nvme_ccb *, struct nvme_cqe *);
59 
60 	/* namespace context */
61 	void		*nnc_cookie;
62 	nvme_nnc_done	nnc_done;
63 	uint16_t	nnc_nsid;
64 	uint16_t	nnc_flags;
65 #define	NVME_NS_CTX_F_READ	__BIT(0)
66 #define	NVME_NS_CTX_F_POLL	__BIT(1)
67 
68 	struct buf	*nnc_buf;
69 	daddr_t		nnc_blkno;
70 	size_t		nnc_datasize;
71 	int		nnc_secsize;
72 };
73 
74 struct nvme_queue {
75 	struct nvme_softc	*q_sc;
76 	kmutex_t		q_sq_mtx;
77 	kmutex_t		q_cq_mtx;
78 	struct nvme_dmamem	*q_sq_dmamem;
79 	struct nvme_dmamem	*q_cq_dmamem;
80 	bus_size_t 		q_sqtdbl; /* submission queue tail doorbell */
81 	bus_size_t 		q_cqhdbl; /* completion queue head doorbell */
82 	uint16_t		q_id;
83 	uint32_t		q_entries;
84 	uint32_t		q_sq_tail;
85 	uint32_t		q_cq_head;
86 	uint16_t		q_cq_phase;
87 
88 	kmutex_t		q_ccb_mtx;
89 	uint16_t		q_nccbs;	/* total number of ccbs */
90 	uint16_t		q_nccbs_avail;	/* available ccbs */
91 	struct nvme_ccb		*q_ccbs;
92 	SIMPLEQ_HEAD(, nvme_ccb) q_ccb_list;
93 	struct nvme_dmamem	*q_ccb_prpls;
94 };
95 
96 struct nvme_namespace {
97 	struct nvm_identify_namespace *ident;
98 	device_t dev;
99 	uint32_t flags;
100 #define	NVME_NS_F_OPEN	__BIT(0)
101 };
102 
103 struct nvme_softc {
104 	device_t		sc_dev;
105 
106 	bus_space_tag_t		sc_iot;
107 	bus_space_handle_t	sc_ioh;
108 	bus_size_t		sc_ios;
109 	bus_dma_tag_t		sc_dmat;
110 
111 	int			(*sc_intr_establish)(struct nvme_softc *,
112 				    uint16_t qid, struct nvme_queue *);
113 	int			(*sc_intr_disestablish)(struct nvme_softc *,
114 				    uint16_t qid);
115 	void			**sc_ih;	/* interrupt handlers */
116 	void			**sc_softih;	/* softintr handlers */
117 
118 	u_int			sc_rdy_to;	/* RDY timeout */
119 	size_t			sc_mps;		/* memory page size */
120 	size_t			sc_mdts;	/* max data trasfer size */
121 	u_int			sc_max_sgl;	/* max S/G segments */
122 
123 	struct nvm_identify_controller
124 				sc_identify;
125 
126 	u_int			sc_nn;		/* namespace count */
127 	struct nvme_namespace	*sc_namespaces;
128 
129 	bool			sc_use_mq;
130 	u_int			sc_nq;		/* # of io queue (sc_q) */
131 	struct nvme_queue	*sc_admin_q;
132 	struct nvme_queue	**sc_q;
133 
134 	uint32_t		sc_flags;
135 #define	NVME_F_ATTACHED	__BIT(0)
136 #define	NVME_F_OPEN	__BIT(1)
137 };
138 
139 #define	lemtoh16(p)	le16toh(*((uint16_t *)(p)))
140 #define	lemtoh32(p)	le32toh(*((uint32_t *)(p)))
141 #define	lemtoh64(p)	le64toh(*((uint64_t *)(p)))
142 #define	htolem16(p, x)	(*((uint16_t *)(p)) = htole16(x))
143 #define	htolem32(p, x)	(*((uint32_t *)(p)) = htole32(x))
144 #define	htolem64(p, x)	(*((uint64_t *)(p)) = htole64(x))
145 
146 struct nvme_attach_args {
147 	uint16_t	naa_nsid;
148 	uint32_t	naa_qentries;	/* total number of queue slots */
149 	uint32_t	naa_maxphys;	/* maximum device transfer size */
150 };
151 
152 int	nvme_attach(struct nvme_softc *);
153 int	nvme_detach(struct nvme_softc *, int flags);
154 int	nvme_rescan(device_t, const char *, const int *);
155 void	nvme_childdet(device_t, device_t);
156 int	nvme_intr(void *);
157 void	nvme_softintr_intx(void *);
158 int	nvme_intr_msi(void *);
159 void	nvme_softintr_msi(void *);
160 
161 static inline struct nvme_queue *
162 nvme_get_q(struct nvme_softc *sc)
163 {
164 	return sc->sc_q[cpu_index(curcpu()) % sc->sc_nq];
165 }
166 
167 /*
168  * namespace
169  */
170 static inline struct nvme_namespace *
171 nvme_ns_get(struct nvme_softc *sc, uint16_t nsid)
172 {
173 	if (nsid == 0 || nsid - 1 >= sc->sc_nn)
174 		return NULL;
175 	return &sc->sc_namespaces[nsid - 1];
176 }
177 
178 int	nvme_ns_identify(struct nvme_softc *, uint16_t);
179 void	nvme_ns_free(struct nvme_softc *, uint16_t);
180 int	nvme_ns_dobio(struct nvme_softc *, uint16_t, void *,
181     struct buf *, void *, size_t, int, daddr_t, int, nvme_nnc_done);
182 int	nvme_ns_sync(struct nvme_softc *, uint16_t, void *, int, nvme_nnc_done);
183 bool	nvme_has_volatile_write_cache(struct nvme_softc *);
184 int	nvme_admin_getcache(struct nvme_softc *, void *, nvme_nnc_done);
185